Application of predictive current control in sewing machine system

This paper discusses the principle of the torque ripple of BLDCM with focuses on the theoretical analysis of the relationships between torque ripple and parameters of windings,motor speed and bus voltage,as well as 3-phase reverse electrodynamic potential during phase converting.Then,a BLDCM drive system used in industrial sewing machine is studied and stop precision of the system is analyzed in detail.Furthermore,a novel predictive current control method of BLDCM is introduced in this paper to minimize torque ripple of the system,which combines the traditional overlap method with the periodicity sampling current control method.The experimental results are presented in the end,which indicate that the better performance of phase current control is obtained during commutation.